Vulcanizing- air-back



ing during the vulcanizing process.

g UNITE 'raras fear GEORGE nivioitY' sArr, or seoimirnivro.,CALIFORNIA.

vULonNrarive Aia-nner.

nascose.

Specification of Letters Patentj f Pat-@nega 'June' 7, 1921' j application inea .october is, ieee. semina. eiaooog.

sectional repairs in pneumatic tire casing.

Among the ob jects of the 'invention are to simplify and cheapen the hrst .cost of such air bags. lTo so construct and arrange the parts of the air bag that its useful life will be prolonged. To so construct and arrange the inet-allie end seals that they will not crease or blemish the interiory of the tire cas- @ther objects and advantages will appear as this description progresses. y

ln this specication andl the annexed drawings, the invention is illustrated in the forni vconsidered to be the best, but it is to be understood that the invention is not limited to such form, because it may be einbodied in other forms; and it is also to be understood that in and by the claims following the description, it is desiredto cover the invention in whatsoever formitmay be embodied. f

In the accompanying one-sheet of drawinner tube 2 may be a piece of the conventional inner tube as used in pneumatic tires, of a length equal to the total length of the fabric body l. The inner tube 2 is inserted within the fabric body 1. Then the plugs l3 are inserted within .the ends of theV inner tube. These plugs have tapered body portions 4 with shoulder portions 5 and have the integral threaded necks vor bolts 6 yand 7 respectively. rThese'plugs are inserted within the endof the bagfabout one inch within the end. rThe annular ferrules 8. are then inserted'over-the ends of 'thebodyportion' 1.

VVlfhese ferrules are of metalandgof substani tially the same taper4 as the bOdiesL-i of the plugs. Theserferrules are provided withv .tliethichened andv rounded ends 9, over vwhich the ends 10A ofthe body portionr and ends 11 of the inner tube are folded back to `inclose the ferrules and retain the saine securely withinth'e ends of the air bag.L

`f the substantially hemispherical end caps 12 and13 are `then inserted over `the necks 6 and 7V untilA their peripheral yportions 13 bear againstthetube andcompress it and thefreturn fold portionr of the body tube i against the roundedends 9 of the ferrules. When the nuts 141 and 15 are screwed on their respective necks 6-and 7 they force the f.

innerjitu'be and the folded ,ends ofthe ail; bag against the/rounded ends 9 'of the ferrules tok form airtight joints, 'cooperating rwith the clamping or squeezing action betweenthe bodies 4; ofthe plugs and the in# terior of the ferrules and forcing' the shoulders 5 up. against the thickened portions 9 y ofthe ferrules, giving a large superficial areaof pressure at the plugs against the interiorsurfaces of the ends of the inner tube to prevent air leakage and thus retain the air pressure within the inner tube.

The neck 7 is provided ywith a central bore 16 to which is attached a flexible hose connection 17 provided with the usual threaded n valve end 1S having ka check valve therein to hold any air'pressure pumped therethrough. This invention operates ksubstantially as follows f The pneumatic tire casing X is inserted within the vulcanizing mold .XR The air bag is then inserted within the casing opposite the section thereof that is to be vulcanized.. The moldsX2 are then assembled on thebeads of the tire casing andthe clamp X3 applied to thevulcanizing mold and the clamping screw XAx screwed'down against thek beadfmolds X2, to form a retaining vulcanthe tire casing at thepoint to bevulcanized.

lizing mold entirely around the'diameter of The air bagis'then pumped up to the de-` sired pressure through the nipple 18 with the effect that the tire casing is forced to completely ll they inclosing tiremold. Steam "heat-is theny appliedr through` the` iio 15 hour cures.

chamber X4 and the cure is completed in accordance with conventional practice.

The conventional air bag having vulcanized ends, and constructed to retain air 5 pressure without the use of an inner tube is capable of eifecting from fifty to seventyive one-hour cures, such a bag costing from live to seven dollars, in accordance with size and present prices. By the use of this invention five hundred and seventyent is:

l. An air bag comprising, a plug; a ferrule encircling said plug; a cap; a separable tube within said bag body, the ends of said bag and said tube being compressible between said plug, ferrule and cap.

2. An air bag comprising, a non-resilient plug having a threaded neck; a ferrule encircling said plug; a cap encircling said neck, and registering with said ferrule; a

bag body; a separable tube within said body, the ends of said body and said tube being folded back over said errule; and a nut on said threaded neck.

3. An air bag comprising 'a substantially non-elastic body; an inner tube within said body; a ferrule surrounding the end of said bag and said tube; a non-resilient plug; a cap; and means for drawing said "ferrule, plug and cap together to compress said ends of said bag and tube.

4. An air bag comprising a substantially non-elastic body; an inner tube within said body; a non-resilient plug having a threaded neck adapted to close an end of said inner tube; a errule encircling said plug and binding said bag and inner tube therebetween; and a cap in threaded engagement with said plug stem for compressing the ends of said inner tube and bag against said Jferrule and` means for locking said cap tightly in position.

5. An air bag comprising a substantially non-elastic body; an inner tube within said body; non-resilient plugs having threaded ends adapted to close the ends of said inner tubes; ferrules encircling said plugs for binding said bags and inner tubes therebetween; caps in threaded engagement with the opposite plug stems for compressing the ends of said inner tube and bag against said ferrules; lock nuts for holding said caps tightly on said stems and a hollow conduit extending through one of said plug stems for lilling said inner tube.

In testimony whereof, I have hereunto set my hand at Sacramento, California, this 24th day of November, 1920.

' GEORGE EMORY SAPI). 

